I do not claim that my opinion is absolutely true.If you've spotted any mistake in my English, please, correct it. I want to be aware of any mistakes to efficiently eliminate them before they become a habit.

Someone told me that "anywayS" is good to use only when you talk to your close friends, etc. That is, VERY informal. That said, when you are looking for a Russian equivalent you have to decide whether to keep this stylistic feature in Russian or drop it (and possibly notify us as to which one you prefer ).
Both "в любом случае" and "так или иначе" are pretty much formal cliches. Informal things like that are "на хрен", "блин", "бля"(obsc), "вообще" or even "ваще" (phonetical contraction like "gonna" or "whatcha").